Valve mechanism.



H. G, ORBLLY & C. C. SAMPSON.

VALVE MBGHANISM.

APPLICATION FILED 0GT.6.1913. 1&265843, Patented F6102, 1915.

. QN wm hl v fran s Arias PATENT onnion HENRY e. oniiiLLY, ,orf Jouer, ILLINOIS, .AND CHARLES o.. sAivirsoiN, 0F DULUTHI,

v MINNESOTA VALVE MECI-IJAN-IS-M.

speciaeation ofretters'ra'tent Appiicaiion med october e, 1913'.y serie-i No. vaaeoa United States, residing at Joliet, in the county of Will, State of Illinois, and Duluth',county of St. Louis, State of Minnesota, respectively, have invented certain,

new and useful Improvements in Valve Mechanism, of which the following is a specification.

' Our invention relates to interna-l combustion engines and has particular' reference toa novel valve control for such engines.

In the operation of internal combustion engines, particularly of the type employing gas as a fuel, which engines are usuallyofvery large Size, the problem of maintaining the spring control for the'piippet-valves is a considerable one. It will be understood that an efficient valve mustf beseatedy tightly, particularly on the suction stroke, yto prevent leakage and that the spring pressure must be sufficient. to accomplish this; however, in the usual methodof application, the spring must be additionally conipressed when the valve is lifted, the greatest force of the spring being exerted thereon while the valve is unseated and no spring pressure is needed; or in other Words, the

'spring is under the least tension or compression, or exerts its smallest, force,when the valve is closed. A further objection to the springs commonly employed is in that on account of the restricted space available springs are designed too near the safe elastic limit and are, therefore, subject to excessive breakage; on account of such breakage it is necessary to replacethe springs Vwhich requires the stoppage of the engine i andr adds materially to the labor charge against the engine, in addition to requiring the stoppage of the machines operated.

thereby. A third objection -to the ordinary form of valve engines is in that they are usually located centrally with relation to the valve stem and in an inclosed space adjacent to the port. On the exhaust s ide this spring is necessarily exposedtoy considerable heat lwhich soon affects theV temper of the spring and adds to the breakage.

We have conceived Ythe idea of locating the valve springs outside of the casing, providing two of such springspand locating the support for the springs on the eccentric bar, whereby the springs move bodilywith the valve stein; By this means the springsY are under practically the saine tension'whethei' the valve is raised or seated. This provides for the maximum eiciency of the spring while the valve is seated without necessitating extreme compression or tensionl in the raised position of the valve. Furthermore, by providingtwo springs and locating them outside of the casing, ifone ofA such springs should become broken, it may easily andqui'ckly be replaced without stopping: the

raeenfeaneei 2,1915.

engine: or materially4 ,decreasingy its eHi-f ciency.

Our invention will be moie readily understood by reference to the accompanying drawings Wherein- Figure-1 is a vertical section through avalve and control therefor, constructed in accordance with our invention, and Fig. 2 isa` side elevation, par-tlyin sections, the view' being taken at right angles to that of Fig. 1.` .y

Referring more particularly to the drawings, it will be seen that we provide an engine 10, to which is secured 'a valve casing 11 having a valve seat 12. A conduit 13 provides Acommunication between the engine vcylinder and an outlet or exhaust manifold. The valve`14 is provided with the usual stem 15 which .extends downward and is threaded into an extension 16, this extension having a bearing 17 on its lower end. Cooperating with the bearing 17 is a lever 18, pivoted at 19, and having a flat bearing surface 20, with which a cani lever 21 coperates; the lever 21 is pivoted at.22 and is actuated by a rod 23 controlled by the eccentric of the engine, not shown.

.The spring control for the valve com-- prises a yoke 24 having a bearing on a 26, the lower ends-of the springs having a i hooked connection to a short rod or shaft'27, inountedat 28 in the cani lever 21; It'will be seen .that as the cam lever 21 is rocked bythe eccentric rod the 1springs' move up and down in unison therewith and in 4unison with the valve, and that the spring tension may be the saine when the valve is seated as whenv it is in the raised position; thus the load is divided betweeny two sprin s, the

springs are not extended beyond their safe, 1110 elastic limit, they are removed from intense heat and either thereoil may be replaced Without interruptions to the operation of the engine.

The rocker arm 21 has the functions of a cam and its equivalents will readily suggest themselves to others. In the claims we have referred to this'element as a cam With the understanding that Y all equivalents are encompassed in the term.

1t is obviousl that certain modifications may be made in the construction shown, and

' the end of said stom, and a spring directly,

such `modifications as are Within the scope of our claims we consider within the spirit of ourinvention.

We, claim: 1. In a valve mechanism, the combination of a valve, a cam element for actuating said valve,y and a spring connecting said valve andl said cam element, said spring being mounted for bodily movement With said cam element Vand said valve, substantially as described.

2. In a valve mechanism, the combination of a valve having a stem, a rocker arm acting as a cam, said' arm being pivoted near connecting saidl valve and said rocker arm,

reasonable whereby said sp ing is lifted bodily with said valve, substantially as described. '1

3. n a valve mechanism, the combination arm, a second rocker arm acting as a cam i5- and acting on said idler to lift said valve', projections on the sides of said valve stem and said second rocker. arm, and springs on said projections connecting the respective parts and adapted for bodily movement with the valve, substantially as described.

` HENRYG. OR-ELLY.

CHARLES C. SAMPSCN. Witnesses for Henry G. CReillys signature:

Cime. .'l. MASON, H. R. KUEHN.

Witnesses for Chas. C. Sampsons signa` ture:

J. H. SMITH, L. C. Reis. y 

